In the Linux kernel, the following vulnerability has been resolved:

nfc: nci: free skb on nci_transceive early error paths

nci_transceive() takes ownership of the skb passed by the caller,
but the -EPROTO, -EINVAL, and -EBUSY error paths return without
freeing it.

Due to issues clearing NCI_DATA_EXCHANGE fixed by subsequent changes
the nci/nci_dev selftest hits the error path occasionally in NIPA,
and kmemleak detects leaks:

unreferenced object 0xff11000015ce6a40 (size 640):
comm "nci_dev", pid 3954, jiffies 4295441246
hex dump (first 32 bytes):
6b 6b 6b 6b 00 a4 00 0c 02 e1 03 6b 6b 6b 6b 6b kkkk.......kkkkk
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
backtrace (crc 7c40cc2a):
kmem_cache_alloc_node_noprof+0x492/0x630
__alloc_skb+0x11e/0x5f0
alloc_skb_with_frags+0xc6/0x8f0
sock_alloc_send_pskb+0x326/0x3f0
nfc_alloc_send_skb+0x94/0x1d0
rawsock_sendmsg+0x162/0x4c0
do_syscall_64+0x117/0xfc0

En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:

nfc: nci: liberar skb en las rutas de error tempranas de nci_transceive

nci_transceive() toma posesión del skb pasado por el llamador,
pero las rutas de error -EPROTO, -EINVAL y -EBUSY regresan sin
liberarlo.

Debido a problemas al limpiar NCI_DATA_EXCHANGE corregidos por cambios posteriores,
la autoprueba nci/nci_dev alcanza la ruta de error ocasionalmente en NIPA,
y kmemleak detecta fugas:

objeto sin referencia 0xff11000015ce6a40 (tamaño 640):
comm 'nci_dev', pid 3954, jiffies 4295441246
volcado hexadecimal (primeros 32 bytes):
6b 6b 6b 6b 00 a4 00 0c 02 e1 03 6b 6b 6b 6b 6b kkkk.......kkkkk
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
backtrace (crc 7c40cc2a):
kmem_cache_alloc_node_noprof+0x492/0x630
__alloc_skb+0x11e/0x5f0
alloc_skb_with_frags+0xc6/0x8f0
sock_alloc_send_pskb+0x326/0x3f0
nfc_alloc_send_skb+0x94/0x1d0
rawsock_sendmsg+0x162/0x4c0
do_syscall_64+0x117/0xfc0